Removable tubular guard for guarding choke means of oil well christmas trees



Oct. 7, 1958 G. w. JONES 2,855,043

' REMOVABLE TUBULAR GUARD FOR GUARDING CHOKE MEANS I OF OIL WELL CHRISTMAS TREES Filed May 17; 1956 2 Sheets-Sheet 1 Guy (Jones INVENTOR ATTORNEYS 2,855,048 REMOVABLE TUBULAR GUARD FOR GUARDING CHOKE MEANS Oct. 7, 1958 G. w. JONES OF OIL WELL CHRISTMAS TREES 2 Sheets-Sheet 2 Filed May 17, 1956 Guy M/Jofies INVENTOR ATTORNEYS.

United States Patent U 2,855,048 REMGVABLE TUBULAR GUARD FOR GUARDING CHQKE MEANS @F GIL WELL CHRISTMAS TREES Guy W. Jones, Corpus Christi, Tex. Application May 17, 1956, Serial No. 585,469 2 Claims. (Cl. 166-91) This invention relates to a guard adapted to be mounted in the fitting of an oil well, commonly known as the F10 Tee to which the choke bean of the oil well Christmas tree is connected.

The primary object of the invention is to provide a guard embodyinga perforated cylinder fitted against the intake end of the choke bean, separating foreign matter from the oil and guarding the usual substantially small bore of the choke bean, against foreign matter entering the same to clog the choke bean and prevent the flow of oil therethrough.

Still another object of the invention is to provide a guard in the form of a perforated cylinder fitted against the intake end of the choke bean, so constructed and arranged that it may be readily removed and replaced should it become necessary to clean or repair the guard.

A further object of the invention is to provide a guard which is held against the intake end of the choke bean, by a coiled spring, means being provided for adjusting the tension of the spring to insure the sleeve being held in close engagement with the end of the choke bean to accomplish the purpose of the invention.

Other and further objects and advantages of the invention will be hereinafter described and the novel features thereof defined in the appended claims.

Referring to the drawings:

Fig. 1 is an elevational View of a fitting, equipped with a guard cylinder constructed and supported in accordance with the invention.

Fig. 2 is a vertical sectional view taken on line 22 of Fig. 1.

Fig. 3 is a sectional view taken through the choke bean of the oil well Christmas tree, the guard cylinder also being shown in section.

Fig. 4 is a sectional view taken on line 4-4 of Fig. 3.

Fig. 5 is a sectional view taken on line 55 of Fig. 3.

Fig. 6 is a sectional view taken on line 6-6 of Fig. 3.

Fig. 7 is a sectional view taken on line 7-7 of Fig. 3.

Referring to the drawings in detail, the fitting commonly known as the Flo-Tee is indicated generally by the reference character 5 and includes an inlet pipe 6 through which oil from the well is flowing, there being provided the usual valve and valve control wheel 7 for controlling the flow of oil into the coupling 8. The reference character 9 indicates a choke nipple which has one end thereof threaded in the coupling 8 as better shown by Fig. 2 of the drawings.

Within the choke nipple 9, is mounted the choke bean 10 which is threaded in the internally threaded end 11 of the choke nipple 9.

As shown by Fig. 3 of the drawings, the choke bean 10 is provided with a substantially small bore 12 which extends along the longitudinal axis of the choke bean, throughout the entire length thereof. Thus it will be seen that the bore through which the oil eventually passes is exceptionally small and will readily clog if some means is not provided for guarding the bore.

The guard in the present showing is indicated by the reference character 13, and embodies a cylinder which is of a diameter substantially equal to the diameter of the choke bean 10, the cylinder having its inner end resting directly against the inner end of the choke bean 10. This guard or cylinder 13 is provided with circular lines of perforations 14, which perforations are of diam- 2,855,048 Patented Oct. 7, 1958 ice eters to guard against foreign matter which would clog the bore 12, from passing into the bore 12.

The outer end of the guard or cylinder 13 is closed by the wall 15 which is provided with a stem 16 extending from the center thereof, the stem 16 providing a support for one end of the coiled spring 1'7, which also bears against the cap 18, so that by rotating the cap 18 the tension of the coiled spring 17 may be regulated to regulate the pressure directed to the outer end of the guard or cylinder 13 to insure the guard or cylinder being held in close engagement with the inner end of the choke bean 10.

It will also be noted that the diameter of the guard or cylinder 13 is considerably less than the diameter of the fitting or coupling 8, in which it is mounted, leaving ample room for the oil and foreign matter which may be carried into the coupling 8 with the oil, to collect between the guard or cylinder and wall of the coupling 8. It will also be noted that if the perforations 14 become clogged, the guard or cylinder 13 may be readily removed by removing the cap 18, whereupon the guard or cylinder may be readily cleaned and the foreign matter which would otherwise prevent the passage of oil through the perforations, removed to insure a free flow of oil through the Christ-mas tree.

It might be further stated that the coiled spring 17 is secured to the stem 16, by the cotter key 19 which is shown as passing between the convolutions of the spring, and held in an opening disposed transversely of the stem 16, and is pressed against the cap 18.

From the foregoing it will be seen that due to the construction shown and described, I have provided a guard or cylinder enclosing the intake end of the choke beam of an oil well Christmas tree to prevent foreign matter from collecting at the intake end of the bore 12 to prevent the flow of oil therethrough and thus retard the pumping operation.

While the specific details of one embodiment of his invention have been herein shown and described, the invention is not confined thereto as changes and alterations may be made without departing from the spirit and scope thereof as defined in the appended claims.

What is claimed is:

1. In an oil well Christmas tree a Flo-Tee, a choke nipple threaded in said Flo-Tee, a choke bean threaded in said nipple through which oil flows from said Flo-Tee, a guard comprising a cylinder, open at one end, having rows of apertures in the wall thereof, the open end of said cylinder being fitted against the intake end of said choke bean, straining the oil passing thereinto, a closure Wall for the other end of said cylinder, a stud on said cylinder, and a spring surrounding said stud releasably biasing said guard in position against said choke bean.

2. In an oil well Christmas tree for a Flo-Tee, a choke nipple adapted to be threaded in the Flo-Tee, a choke bean threaded in said nipple through which oil flows from the Flo-Tee, a guard comprising a cylindrical member open at one end, and having openings in the wall thereof through which oil passes to said choke bean, the open end of said cylinder being fitted against the intake end of the choke bean, a wall closing the other end of said nipple, a wall closing the other end of said guard, and spring means between said first and second mentioned walls normally biasing said guard against said-choke bean.

References Cited in the file of this patent UNITED STATES PATENTS 

